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<div class="subTitle">org.apache.commons.math3.linear</div>
<h2 title="Class RealVector" class="title">Class RealVector</h2>
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<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<li>org.apache.commons.math3.linear.RealVector</li>
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<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../org/apache/commons/math3/linear/ArrayRealVector.html" title="class in org.apache.commons.math3.linear">ArrayRealVector</a>, <a href="../../../../../org/apache/commons/math3/linear/SparseRealVector.html" title="class in org.apache.commons.math3.linear">SparseRealVector</a></dd>
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<pre>public abstract class <span class="strong">RealVector</span>
extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">Class defining a real-valued vector with basic algebraic operations.
 <p>
 vector element indexing is 0-based -- e.g., <code>getEntry(0)</code>
 returns the first element of the vector.
 </p>
 <p>
 The <code>code map</code> and <code>mapToSelf</code> methods operate
 on vectors element-wise, i.e. they perform the same operation (adding a scalar,
 applying a function ...) on each element in turn. The <code>map</code>
 versions create a new vector to hold the result and do not change the instance.
 The <code>mapToSelf</code> version uses the instance itself to store the
 results, so the instance is changed by this method. In all cases, the result
 vector is returned by the methods, allowing the <i>fluent API</i>
 style, like this:
 </p>
 <pre>
   RealVector result = v.mapAddToSelf(3.4).mapToSelf(new Tan()).mapToSelf(new Power(2.3));
 </pre></div>
<dl><dt><span class="strong">Since:</span></dt>
  <dd>2.1</dd></dl>
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<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected class&nbsp;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.Entry.html" title="class in org.apache.commons.math3.linear">RealVector.Entry</a></strong></code>
<div class="block">An entry in the vector.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected class&nbsp;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.SparseEntryIterator.html" title="class in org.apache.commons.math3.linear">RealVector.SparseEntryIterator</a></strong></code>
<div class="block">This class should rarely be used, but is here to provide
 a default implementation of sparseIterator(), which is implemented
 by walking over the entries, skipping those that are zero.</div>
</td>
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<h3>Constructor Summary</h3>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#RealVector()">RealVector</a></strong>()</code>&nbsp;</td>
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<h3>Method Summary</h3>
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<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#add(org.apache.commons.math3.linear.RealVector)">add</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Compute the sum of this vector and <code>v</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#addToEntry(int,%20double)">addToEntry</a></strong>(int&nbsp;index,
          double&nbsp;increment)</code>
<div class="block">Change an entry at the specified index.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>abstract <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#append(double)">append</a></strong>(double&nbsp;d)</code>
<div class="block">Construct a new vector by appending a double to this vector.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>abstract <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#append(org.apache.commons.math3.linear.RealVector)">append</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Construct a new vector by appending a vector to this vector.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#checkIndex(int)">checkIndex</a></strong>(int&nbsp;index)</code>
<div class="block">Check if an index is valid.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#checkIndices(int,%20int)">checkIndices</a></strong>(int&nbsp;start,
            int&nbsp;end)</code>
<div class="block">Checks that the indices of a subvector are valid.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#checkVectorDimensions(int)">checkVectorDimensions</a></strong>(int&nbsp;n)</code>
<div class="block">Check if instance dimension is equal to some expected value.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#checkVectorDimensions(org.apache.commons.math3.linear.RealVector)">checkVectorDimensions</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Check if instance and specified vectors have the same dimension.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#combine(double,%20double,%20org.apache.commons.math3.linear.RealVector)">combine</a></strong>(double&nbsp;a,
       double&nbsp;b,
       <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;y)</code>
<div class="block">Returns a new vector representing <code>a * this + b * y</code>, the linear
 combination of <code>this</code> and <code>y</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#combineToSelf(double,%20double,%20org.apache.commons.math3.linear.RealVector)">combineToSelf</a></strong>(double&nbsp;a,
             double&nbsp;b,
             <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;y)</code>
<div class="block">Updates <code>this</code> with the linear combination of <code>this</code> and
 <code>y</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>abstract <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#copy()">copy</a></strong>()</code>
<div class="block">Returns a (deep) copy of this vector.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#cosine(org.apache.commons.math3.linear.RealVector)">cosine</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Computes the cosine of the angle between this vector and the
 argument.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#dotProduct(org.apache.commons.math3.linear.RealVector)">dotProduct</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Compute the dot product of this vector with <code>v</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>abstract <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#ebeDivide(org.apache.commons.math3.linear.RealVector)">ebeDivide</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Element-by-element division.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>abstract <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#ebeMultiply(org.apache.commons.math3.linear.RealVector)">ebeMultiply</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Element-by-element multiplication.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#equals(java.lang.Object)">equals</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;other)</code>
<div class="block">
 Test for the equality of two real vectors.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>abstract int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getDimension()">getDimension</a></strong>()</code>
<div class="block">Returns the size of the vector.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getDistance(org.apache.commons.math3.linear.RealVector)">getDistance</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Distance between two vectors.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>abstract double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getEntry(int)">getEntry</a></strong>(int&nbsp;index)</code>
<div class="block">Return the entry at the specified index.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getL1Distance(org.apache.commons.math3.linear.RealVector)">getL1Distance</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Distance between two vectors.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getL1Norm()">getL1Norm</a></strong>()</code>
<div class="block">Returns the L<sub>1</sub> norm of the vector.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getLInfDistance(org.apache.commons.math3.linear.RealVector)">getLInfDistance</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Distance between two vectors.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getLInfNorm()">getLInfNorm</a></strong>()</code>
<div class="block">Returns the L<sub>&infin;</sub> norm of the vector.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getMaxIndex()">getMaxIndex</a></strong>()</code>
<div class="block">Get the index of the maximum entry.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getMaxValue()">getMaxValue</a></strong>()</code>
<div class="block">Get the value of the maximum entry.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getMinIndex()">getMinIndex</a></strong>()</code>
<div class="block">Get the index of the minimum entry.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getMinValue()">getMinValue</a></strong>()</code>
<div class="block">Get the value of the minimum entry.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getNorm()">getNorm</a></strong>()</code>
<div class="block">Returns the L<sub>2</sub> norm of the vector.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>abstract <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getSubVector(int,%20int)">getSubVector</a></strong>(int&nbsp;index,
            int&nbsp;n)</code>
<div class="block">Get a subvector from consecutive elements.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#hashCode()">hashCode</a></strong>()</code>
<div class="block">.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>abstract boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#isInfinite()">isInfinite</a></strong>()</code>
<div class="block">Check whether any coordinate of this vector is infinite and none are <code>NaN</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>abstract boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#isNaN()">isNaN</a></strong>()</code>
<div class="block">Check whether any coordinate of this vector is <code>NaN</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../../../org/apache/commons/math3/linear/RealVector.Entry.html" title="class in org.apache.commons.math3.linear">RealVector.Entry</a>&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#iterator()">iterator</a></strong>()</code>
<div class="block">Generic dense iterator.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#map(org.apache.commons.math3.analysis.UnivariateFunction)">map</a></strong>(<a href="../../../../../org/apache/commons/math3/analysis/UnivariateFunction.html" title="interface in org.apache.commons.math3.analysis">UnivariateFunction</a>&nbsp;function)</code>
<div class="block">Acts as if implemented as:</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#mapAdd(double)">mapAdd</a></strong>(double&nbsp;d)</code>
<div class="block">Add a value to each entry.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#mapAddToSelf(double)">mapAddToSelf</a></strong>(double&nbsp;d)</code>
<div class="block">Add a value to each entry.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#mapDivide(double)">mapDivide</a></strong>(double&nbsp;d)</code>
<div class="block">Divide each entry by the argument.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#mapDivideToSelf(double)">mapDivideToSelf</a></strong>(double&nbsp;d)</code>
<div class="block">Divide each entry by the argument.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#mapMultiply(double)">mapMultiply</a></strong>(double&nbsp;d)</code>
<div class="block">Multiply each entry by the argument.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#mapMultiplyToSelf(double)">mapMultiplyToSelf</a></strong>(double&nbsp;d)</code>
<div class="block">Multiply each entry.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#mapSubtract(double)">mapSubtract</a></strong>(double&nbsp;d)</code>
<div class="block">Subtract a value from each entry.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#mapSubtractToSelf(double)">mapSubtractToSelf</a></strong>(double&nbsp;d)</code>
<div class="block">Subtract a value from each entry.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#mapToSelf(org.apache.commons.math3.analysis.UnivariateFunction)">mapToSelf</a></strong>(<a href="../../../../../org/apache/commons/math3/analysis/UnivariateFunction.html" title="interface in org.apache.commons.math3.analysis">UnivariateFunction</a>&nbsp;function)</code>
<div class="block">Acts as if it is implemented as:</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealMatrix.html" title="interface in org.apache.commons.math3.linear">RealMatrix</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#outerProduct(org.apache.commons.math3.linear.RealVector)">outerProduct</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Compute the outer product.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#projection(org.apache.commons.math3.linear.RealVector)">projection</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Find the orthogonal projection of this vector onto another vector.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#set(double)">set</a></strong>(double&nbsp;value)</code>
<div class="block">Set all elements to a single value.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#setEntry(int,%20double)">setEntry</a></strong>(int&nbsp;index,
        double&nbsp;value)</code>
<div class="block">Set a single element.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#setSubVector(int,%20org.apache.commons.math3.linear.RealVector)">setSubVector</a></strong>(int&nbsp;index,
            <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Set a sequence of consecutive elements.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../../../org/apache/commons/math3/linear/RealVector.Entry.html" title="class in org.apache.commons.math3.linear">RealVector.Entry</a>&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#sparseIterator()">sparseIterator</a></strong>()</code>
<div class="block">Create a sparse iterator over the vector, which may omit some entries.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#subtract(org.apache.commons.math3.linear.RealVector)">subtract</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Subtract <code>v</code> from this vector.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#toArray()">toArray</a></strong>()</code>
<div class="block">Convert the vector to an array of <code>double</code>s.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#unitize()">unitize</a></strong>()</code>
<div class="block">Converts this vector into a unit vector.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#unitVector()">unitVector</a></strong>()</code>
<div class="block">Creates a unit vector pointing in the direction of this vector.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#unmodifiableRealVector(org.apache.commons.math3.linear.RealVector)">unmodifiableRealVector</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</code>
<div class="block">Returns an unmodifiable view of the specified vector.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#walkInDefaultOrder(org.apache.commons.math3.linear.RealVectorChangingVisitor)">walkInDefaultOrder</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorChangingVisitor</a>&nbsp;visitor)</code>
<div class="block">Visits (and possibly alters) all entries of this vector in default order
 (increasing index).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#walkInDefaultOrder(org.apache.commons.math3.linear.RealVectorChangingVisitor,%20int,%20int)">walkInDefaultOrder</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorChangingVisitor</a>&nbsp;visitor,
                  int&nbsp;start,
                  int&nbsp;end)</code>
<div class="block">Visits (and possibly alters) some entries of this vector in default order
 (increasing index).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#walkInDefaultOrder(org.apache.commons.math3.linear.RealVectorPreservingVisitor)">walkInDefaultOrder</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorPreservingVisitor</a>&nbsp;visitor)</code>
<div class="block">Visits (but does not alter) all entries of this vector in default order
 (increasing index).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#walkInDefaultOrder(org.apache.commons.math3.linear.RealVectorPreservingVisitor,%20int,%20int)">walkInDefaultOrder</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorPreservingVisitor</a>&nbsp;visitor,
                  int&nbsp;start,
                  int&nbsp;end)</code>
<div class="block">Visits (but does not alter) some entries of this vector in default order
 (increasing index).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#walkInOptimizedOrder(org.apache.commons.math3.linear.RealVectorChangingVisitor)">walkInOptimizedOrder</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorChangingVisitor</a>&nbsp;visitor)</code>
<div class="block">Visits (and possibly alters) all entries of this vector in optimized
 order.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#walkInOptimizedOrder(org.apache.commons.math3.linear.RealVectorChangingVisitor,%20int,%20int)">walkInOptimizedOrder</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorChangingVisitor</a>&nbsp;visitor,
                    int&nbsp;start,
                    int&nbsp;end)</code>
<div class="block">Visits (and possibly change) some entries of this vector in optimized
 order.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#walkInOptimizedOrder(org.apache.commons.math3.linear.RealVectorPreservingVisitor)">walkInOptimizedOrder</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorPreservingVisitor</a>&nbsp;visitor)</code>
<div class="block">Visits (but does not alter) all entries of this vector in optimized
 order.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#walkInOptimizedOrder(org.apache.commons.math3.linear.RealVectorPreservingVisitor,%20int,%20int)">walkInOptimizedOrder</a></strong>(<a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorPreservingVisitor</a>&nbsp;visitor,
                    int&nbsp;start,
                    int&nbsp;end)</code>
<div class="block">Visits (but does not alter) some entries of this vector in optimized
 order.</div>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
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<h3>Constructor Detail</h3>
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<pre>public&nbsp;RealVector()</pre>
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<pre>public abstract&nbsp;int&nbsp;getDimension()</pre>
<div class="block">Returns the size of the vector.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the size of this vector.</dd></dl>
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<pre>public abstract&nbsp;double&nbsp;getEntry(int&nbsp;index)
                         throws <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Return the entry at the specified index.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - Index location of entry to be fetched.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the vector entry at <code>index</code>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if the index is not valid.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#setEntry(int,%20double)"><code>setEntry(int, double)</code></a></dd></dl>
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<h4>setEntry</h4>
<pre>public abstract&nbsp;void&nbsp;setEntry(int&nbsp;index,
            double&nbsp;value)
                       throws <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Set a single element.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - element index.</dd><dd><code>value</code> - new value for the element.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if the index is not valid.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getEntry(int)"><code>getEntry(int)</code></a></dd></dl>
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<pre>public&nbsp;void&nbsp;addToEntry(int&nbsp;index,
              double&nbsp;increment)
                throws <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Change an entry at the specified index.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - Index location of entry to be set.</dd><dd><code>increment</code> - Value to add to the vector entry.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if the index is not valid.</dd><dt><span class="strong">Since:</span></dt>
  <dd>3.0</dd></dl>
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<h4>append</h4>
<pre>public abstract&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;append(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</pre>
<div class="block">Construct a new vector by appending a vector to this vector.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - vector to append to this one.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a new vector.</dd></dl>
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<h4>append</h4>
<pre>public abstract&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;append(double&nbsp;d)</pre>
<div class="block">Construct a new vector by appending a double to this vector.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>d</code> - double to append.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a new vector.</dd></dl>
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<h4>getSubVector</h4>
<pre>public abstract&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;getSubVector(int&nbsp;index,
                      int&nbsp;n)
                                 throws <a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a>,
                                        <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Get a subvector from consecutive elements.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - index of first element.</dd><dd><code>n</code> - number of elements to be retrieved.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a vector containing n elements.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if the index is not valid.</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></code> - if the number of elements is not positive.</dd></dl>
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<h4>setSubVector</h4>
<pre>public abstract&nbsp;void&nbsp;setSubVector(int&nbsp;index,
                <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
                           throws <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Set a sequence of consecutive elements.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - index of first element to be set.</dd><dd><code>v</code> - vector containing the values to set.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if the index is not valid.</dd></dl>
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<pre>public abstract&nbsp;boolean&nbsp;isNaN()</pre>
<div class="block">Check whether any coordinate of this vector is <code>NaN</code>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if any coordinate of this vector is <code>NaN</code>,
 <code>false</code> otherwise.</dd></dl>
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<pre>public abstract&nbsp;boolean&nbsp;isInfinite()</pre>
<div class="block">Check whether any coordinate of this vector is infinite and none are <code>NaN</code>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if any coordinate of this vector is infinite and
 none are <code>NaN</code>, <code>false</code> otherwise.</dd></dl>
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<pre>protected&nbsp;void&nbsp;checkVectorDimensions(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
                              throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Check if instance and specified vectors have the same dimension.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector to compare instance with.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if the vectors do not
 have the same dimension.</dd></dl>
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                              throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Check if instance dimension is equal to some expected value.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - Expected dimension.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if the dimension is
 inconsistent with the vector size.</dd></dl>
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<pre>protected&nbsp;void&nbsp;checkIndex(int&nbsp;index)
                   throws <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Check if an index is valid.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - Index to check.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if <code>index</code> is not valid.</dd></dl>
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<pre>protected&nbsp;void&nbsp;checkIndices(int&nbsp;start,
                int&nbsp;end)
                     throws <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a>,
                            <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Checks that the indices of a subvector are valid.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>start</code> - the index of the first entry of the subvector</dd><dd><code>end</code> - the index of the last entry of the subvector (inclusive)</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if <code>start</code> of <code>end</code> are not valid</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></code> - if <code>end &lt; start</code></dd><dt><span class="strong">Since:</span></dt>
  <dd>3.1</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;add(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
               throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Compute the sum of this vector and <code>v</code>.
 Returns a new vector. Does not change instance data.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector to be added.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code> + <code>v</code>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>v</code> is not the same size as
 <code>this</code> vector.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;subtract(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
                    throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Subtract <code>v</code> from this vector.
 Returns a new vector. Does not change instance data.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector to be subtracted.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code> - <code>v</code>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>v</code> is not the same size as
 <code>this</code> vector.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;mapAdd(double&nbsp;d)</pre>
<div class="block">Add a value to each entry.
 Returns a new vector. Does not change instance data.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>d</code> - Value to be added to each entry.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code> + <code>d</code>.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;mapAddToSelf(double&nbsp;d)</pre>
<div class="block">Add a value to each entry.
 The instance is changed in-place.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>d</code> - Value to be added to each entry.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code>.</dd></dl>
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<pre>public abstract&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;copy()</pre>
<div class="block">Returns a (deep) copy of this vector.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a vector copy.</dd></dl>
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<pre>public&nbsp;double&nbsp;dotProduct(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
                  throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Compute the dot product of this vector with <code>v</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector with which dot product should be computed</dd>
<dt><span class="strong">Returns:</span></dt><dd>the scalar dot product between this instance and <code>v</code>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>v</code> is not the same size as
 <code>this</code> vector.</dd></dl>
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<pre>public&nbsp;double&nbsp;cosine(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
              throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a>,
                     <a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></pre>
<div class="block">Computes the cosine of the angle between this vector and the
 argument.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the cosine of the angle between this vector and <code>v</code>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></code> - if <code>this</code> or <code>v</code> is the null
 vector</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if the dimensions of <code>this</code> and
 <code>v</code> do not match</dd></dl>
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<pre>public abstract&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;ebeDivide(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
                              throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Element-by-element division.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector by which instance elements must be divided.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a vector containing this[i] / v[i] for all i.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>v</code> is not the same size as
 <code>this</code> vector.</dd></dl>
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<pre>public abstract&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;ebeMultiply(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
                                throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Element-by-element multiplication.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector by which instance elements must be multiplied</dd>
<dt><span class="strong">Returns:</span></dt><dd>a vector containing this[i] * v[i] for all i.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>v</code> is not the same size as
 <code>this</code> vector.</dd></dl>
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<pre>public&nbsp;double&nbsp;getDistance(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
                   throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Distance between two vectors.
 <p>This method computes the distance consistent with the
 L<sub>2</sub> norm, i.e. the square root of the sum of
 element differences, or Euclidean distance.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector to which distance is requested.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the distance between two vectors.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>v</code> is not the same size as
 <code>this</code> vector.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getL1Distance(org.apache.commons.math3.linear.RealVector)"><code>getL1Distance(RealVector)</code></a>, 
<a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getLInfDistance(org.apache.commons.math3.linear.RealVector)"><code>getLInfDistance(RealVector)</code></a>, 
<a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getNorm()"><code>getNorm()</code></a></dd></dl>
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<pre>public&nbsp;double&nbsp;getNorm()</pre>
<div class="block">Returns the L<sub>2</sub> norm of the vector.
 <p>The L<sub>2</sub> norm is the root of the sum of
 the squared elements.</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the norm.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getL1Norm()"><code>getL1Norm()</code></a>, 
<a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getLInfNorm()"><code>getLInfNorm()</code></a>, 
<a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getDistance(org.apache.commons.math3.linear.RealVector)"><code>getDistance(RealVector)</code></a></dd></dl>
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<pre>public&nbsp;double&nbsp;getL1Norm()</pre>
<div class="block">Returns the L<sub>1</sub> norm of the vector.
 <p>The L<sub>1</sub> norm is the sum of the absolute
 values of the elements.</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the norm.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getNorm()"><code>getNorm()</code></a>, 
<a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getLInfNorm()"><code>getLInfNorm()</code></a>, 
<a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getL1Distance(org.apache.commons.math3.linear.RealVector)"><code>getL1Distance(RealVector)</code></a></dd></dl>
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<pre>public&nbsp;double&nbsp;getLInfNorm()</pre>
<div class="block">Returns the L<sub>&infin;</sub> norm of the vector.
 <p>The L<sub>&infin;</sub> norm is the max of the absolute
 values of the elements.</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the norm.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getNorm()"><code>getNorm()</code></a>, 
<a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getL1Norm()"><code>getL1Norm()</code></a>, 
<a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getLInfDistance(org.apache.commons.math3.linear.RealVector)"><code>getLInfDistance(RealVector)</code></a></dd></dl>
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<pre>public&nbsp;double&nbsp;getL1Distance(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
                     throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Distance between two vectors.
 <p>This method computes the distance consistent with
 L<sub>1</sub> norm, i.e. the sum of the absolute values of
 the elements differences.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector to which distance is requested.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the distance between two vectors.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>v</code> is not the same size as
 <code>this</code> vector.</dd></dl>
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<pre>public&nbsp;double&nbsp;getLInfDistance(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
                       throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Distance between two vectors.
 <p>This method computes the distance consistent with
 L<sub>&infin;</sub> norm, i.e. the max of the absolute values of
 element differences.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector to which distance is requested.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the distance between two vectors.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>v</code> is not the same size as
 <code>this</code> vector.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getDistance(org.apache.commons.math3.linear.RealVector)"><code>getDistance(RealVector)</code></a>, 
<a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getL1Distance(org.apache.commons.math3.linear.RealVector)"><code>getL1Distance(RealVector)</code></a>, 
<a href="../../../../../org/apache/commons/math3/linear/RealVector.html#getLInfNorm()"><code>getLInfNorm()</code></a></dd></dl>
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<pre>public&nbsp;int&nbsp;getMinIndex()</pre>
<div class="block">Get the index of the minimum entry.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the index of the minimum entry or -1 if vector length is 0
 or all entries are <code>NaN</code>.</dd></dl>
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<pre>public&nbsp;double&nbsp;getMinValue()</pre>
<div class="block">Get the value of the minimum entry.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the value of the minimum entry or <code>NaN</code> if all
 entries are <code>NaN</code>.</dd></dl>
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<pre>public&nbsp;int&nbsp;getMaxIndex()</pre>
<div class="block">Get the index of the maximum entry.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the index of the maximum entry or -1 if vector length is 0
 or all entries are <code>NaN</code></dd></dl>
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<pre>public&nbsp;double&nbsp;getMaxValue()</pre>
<div class="block">Get the value of the maximum entry.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the value of the maximum entry or <code>NaN</code> if all
 entries are <code>NaN</code>.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;mapMultiply(double&nbsp;d)</pre>
<div class="block">Multiply each entry by the argument. Returns a new vector.
 Does not change instance data.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>d</code> - Multiplication factor.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code> * <code>d</code>.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;mapMultiplyToSelf(double&nbsp;d)</pre>
<div class="block">Multiply each entry.
 The instance is changed in-place.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>d</code> - Multiplication factor.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code>.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;mapSubtract(double&nbsp;d)</pre>
<div class="block">Subtract a value from each entry. Returns a new vector.
 Does not change instance data.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>d</code> - Value to be subtracted.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code> - <code>d</code>.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;mapSubtractToSelf(double&nbsp;d)</pre>
<div class="block">Subtract a value from each entry.
 The instance is changed in-place.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>d</code> - Value to be subtracted.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code>.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;mapDivide(double&nbsp;d)</pre>
<div class="block">Divide each entry by the argument. Returns a new vector.
 Does not change instance data.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>d</code> - Value to divide by.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code> / <code>d</code>.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;mapDivideToSelf(double&nbsp;d)</pre>
<div class="block">Divide each entry by the argument.
 The instance is changed in-place.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>d</code> - Value to divide by.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code>.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealMatrix.html" title="interface in org.apache.commons.math3.linear">RealMatrix</a>&nbsp;outerProduct(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</pre>
<div class="block">Compute the outer product.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector with which outer product should be computed.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the matrix outer product between this instance and <code>v</code>.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;projection(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)
                      throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a>,
                             <a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></pre>
<div class="block">Find the orthogonal projection of this vector onto another vector.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - vector onto which instance must be projected.</dd>
<dt><span class="strong">Returns:</span></dt><dd>projection of the instance onto <code>v</code>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>v</code> is not the same size as
 <code>this</code> vector.</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></code> - if <code>this</code> or <code>v</code> is the null
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<pre>public&nbsp;void&nbsp;set(double&nbsp;value)</pre>
<div class="block">Set all elements to a single value.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>value</code> - Single value to set for all elements.</dd></dl>
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<pre>public&nbsp;double[]&nbsp;toArray()</pre>
<div class="block">Convert the vector to an array of <code>double</code>s.
 The array is independent from this vector data: the elements
 are copied.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>an array containing a copy of the vector elements.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;unitVector()
                      throws <a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></pre>
<div class="block">Creates a unit vector pointing in the direction of this vector.
 The instance is not changed by this method.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a unit vector pointing in direction of this vector.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></code> - if the norm is zero.</dd></dl>
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<pre>public&nbsp;void&nbsp;unitize()
             throws <a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></pre>
<div class="block">Converts this vector into a unit vector.
 The instance itself is changed by this method.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></code> - if the norm is zero.</dd></dl>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../../../org/apache/commons/math3/linear/RealVector.Entry.html" title="class in org.apache.commons.math3.linear">RealVector.Entry</a>&gt;&nbsp;sparseIterator()</pre>
<div class="block">Create a sparse iterator over the vector, which may omit some entries.
 The ommitted entries are either exact zeroes (for dense implementations)
 or are the entries which are not stored (for real sparse vectors).
 No guarantees are made about order of iteration.

 <p>Note: derived classes are required to return an <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util"><code>Iterator</code></a> that
 returns non-null <a href="../../../../../org/apache/commons/math3/linear/RealVector.Entry.html" title="class in org.apache.commons.math3.linear"><code>RealVector.Entry</code></a> objects as long as <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true#hasNext()" title="class or interface in java.util"><code>Iterator.hasNext()</code></a>
 returns <code>true</code>.</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a sparse iterator.</dd></dl>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../../../org/apache/commons/math3/linear/RealVector.Entry.html" title="class in org.apache.commons.math3.linear">RealVector.Entry</a>&gt;&nbsp;iterator()</pre>
<div class="block">Generic dense iterator. Iteration is in increasing order
 of the vector index.

 <p>Note: derived classes are required to return an <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util"><code>Iterator</code></a> that
 returns non-null <a href="../../../../../org/apache/commons/math3/linear/RealVector.Entry.html" title="class in org.apache.commons.math3.linear"><code>RealVector.Entry</code></a> objects as long as <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true#hasNext()" title="class or interface in java.util"><code>Iterator.hasNext()</code></a>
 returns <code>true</code>.</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a dense iterator.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;map(<a href="../../../../../org/apache/commons/math3/analysis/UnivariateFunction.html" title="interface in org.apache.commons.math3.analysis">UnivariateFunction</a>&nbsp;function)</pre>
<div class="block">Acts as if implemented as:
 <pre>
  return copy().mapToSelf(function);
 </pre>
 Returns a new vector. Does not change instance data.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>function</code> - Function to apply to each entry.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a new vector.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;mapToSelf(<a href="../../../../../org/apache/commons/math3/analysis/UnivariateFunction.html" title="interface in org.apache.commons.math3.analysis">UnivariateFunction</a>&nbsp;function)</pre>
<div class="block">Acts as if it is implemented as:
 <pre>
  Entry e = null;
  for(Iterator<Entry> it = iterator(); it.hasNext(); e = it.next()) {
      e.setValue(function.value(e.getValue()));
  }
 </pre>
 Entries of this vector are modified in-place by this method.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>function</code> - Function to apply to each entry.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a reference to this vector.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;combine(double&nbsp;a,
                 double&nbsp;b,
                 <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;y)
                   throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Returns a new vector representing <code>a * this + b * y</code>, the linear
 combination of <code>this</code> and <code>y</code>.
 Returns a new vector. Does not change instance data.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - Coefficient of <code>this</code>.</dd><dd><code>b</code> - Coefficient of <code>y</code>.</dd><dd><code>y</code> - Vector with which <code>this</code> is linearly combined.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a vector containing <code>a * this[i] + b * y[i]</code> for all
 <code>i</code>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>y</code> is not the same size as
 <code>this</code> vector.</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;combineToSelf(double&nbsp;a,
                       double&nbsp;b,
                       <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;y)
                         throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></pre>
<div class="block">Updates <code>this</code> with the linear combination of <code>this</code> and
 <code>y</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - Weight of <code>this</code>.</dd><dd><code>b</code> - Weight of <code>y</code>.</dd><dd><code>y</code> - Vector with which <code>this</code> is linearly combined.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>this</code>, with components equal to
 <code>a * this[i] + b * y[i]</code> for all <code>i</code>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if <code>y</code> is not the same size as
 <code>this</code> vector.</dd></dl>
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<pre>public&nbsp;double&nbsp;walkInDefaultOrder(<a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorPreservingVisitor</a>&nbsp;visitor)</pre>
<div class="block">Visits (but does not alter) all entries of this vector in default order
 (increasing index).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>visitor</code> - the visitor to be used to process the entries of this
 vector</dd>
<dt><span class="strong">Returns:</span></dt><dd>the value returned by <a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html#end()"><code>RealVectorPreservingVisitor.end()</code></a>
 at the end of the walk</dd><dt><span class="strong">Since:</span></dt>
  <dd>3.1</dd></dl>
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<pre>public&nbsp;double&nbsp;walkInDefaultOrder(<a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorPreservingVisitor</a>&nbsp;visitor,
                        int&nbsp;start,
                        int&nbsp;end)
                          throws <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a>,
                                 <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Visits (but does not alter) some entries of this vector in default order
 (increasing index).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>visitor</code> - visitor to be used to process the entries of this vector</dd><dd><code>start</code> - the index of the first entry to be visited</dd><dd><code>end</code> - the index of the last entry to be visited (inclusive)</dd>
<dt><span class="strong">Returns:</span></dt><dd>the value returned by <a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html#end()"><code>RealVectorPreservingVisitor.end()</code></a>
 at the end of the walk</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></code> - if <code>end &lt; start</code>.</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if the indices are not valid.</dd><dt><span class="strong">Since:</span></dt>
  <dd>3.1</dd></dl>
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<pre>public&nbsp;double&nbsp;walkInOptimizedOrder(<a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorPreservingVisitor</a>&nbsp;visitor)</pre>
<div class="block">Visits (but does not alter) all entries of this vector in optimized
 order. The order in which the entries are visited is selected so as to
 lead to the most efficient implementation; it might depend on the
 concrete implementation of this abstract class.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>visitor</code> - the visitor to be used to process the entries of this
 vector</dd>
<dt><span class="strong">Returns:</span></dt><dd>the value returned by <a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html#end()"><code>RealVectorPreservingVisitor.end()</code></a>
 at the end of the walk</dd><dt><span class="strong">Since:</span></dt>
  <dd>3.1</dd></dl>
</li>
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<pre>public&nbsp;double&nbsp;walkInOptimizedOrder(<a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorPreservingVisitor</a>&nbsp;visitor,
                          int&nbsp;start,
                          int&nbsp;end)
                            throws <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a>,
                                   <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Visits (but does not alter) some entries of this vector in optimized
 order. The order in which the entries are visited is selected so as to
 lead to the most efficient implementation; it might depend on the
 concrete implementation of this abstract class.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>visitor</code> - visitor to be used to process the entries of this vector</dd><dd><code>start</code> - the index of the first entry to be visited</dd><dd><code>end</code> - the index of the last entry to be visited (inclusive)</dd>
<dt><span class="strong">Returns:</span></dt><dd>the value returned by <a href="../../../../../org/apache/commons/math3/linear/RealVectorPreservingVisitor.html#end()"><code>RealVectorPreservingVisitor.end()</code></a>
 at the end of the walk</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></code> - if <code>end &lt; start</code>.</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if the indices are not valid.</dd><dt><span class="strong">Since:</span></dt>
  <dd>3.1</dd></dl>
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<pre>public&nbsp;double&nbsp;walkInDefaultOrder(<a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorChangingVisitor</a>&nbsp;visitor)</pre>
<div class="block">Visits (and possibly alters) all entries of this vector in default order
 (increasing index).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>visitor</code> - the visitor to be used to process and modify the entries
 of this vector</dd>
<dt><span class="strong">Returns:</span></dt><dd>the value returned by <a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html#end()"><code>RealVectorChangingVisitor.end()</code></a>
 at the end of the walk</dd><dt><span class="strong">Since:</span></dt>
  <dd>3.1</dd></dl>
</li>
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<pre>public&nbsp;double&nbsp;walkInDefaultOrder(<a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorChangingVisitor</a>&nbsp;visitor,
                        int&nbsp;start,
                        int&nbsp;end)
                          throws <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a>,
                                 <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Visits (and possibly alters) some entries of this vector in default order
 (increasing index).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>visitor</code> - visitor to be used to process the entries of this vector</dd><dd><code>start</code> - the index of the first entry to be visited</dd><dd><code>end</code> - the index of the last entry to be visited (inclusive)</dd>
<dt><span class="strong">Returns:</span></dt><dd>the value returned by <a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html#end()"><code>RealVectorChangingVisitor.end()</code></a>
 at the end of the walk</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></code> - if <code>end &lt; start</code>.</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if the indices are not valid.</dd><dt><span class="strong">Since:</span></dt>
  <dd>3.1</dd></dl>
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<pre>public&nbsp;double&nbsp;walkInOptimizedOrder(<a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorChangingVisitor</a>&nbsp;visitor)</pre>
<div class="block">Visits (and possibly alters) all entries of this vector in optimized
 order. The order in which the entries are visited is selected so as to
 lead to the most efficient implementation; it might depend on the
 concrete implementation of this abstract class.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>visitor</code> - the visitor to be used to process the entries of this
 vector</dd>
<dt><span class="strong">Returns:</span></dt><dd>the value returned by <a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html#end()"><code>RealVectorChangingVisitor.end()</code></a>
 at the end of the walk</dd><dt><span class="strong">Since:</span></dt>
  <dd>3.1</dd></dl>
</li>
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<pre>public&nbsp;double&nbsp;walkInOptimizedOrder(<a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html" title="interface in org.apache.commons.math3.linear">RealVectorChangingVisitor</a>&nbsp;visitor,
                          int&nbsp;start,
                          int&nbsp;end)
                            throws <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a>,
                                   <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Visits (and possibly change) some entries of this vector in optimized
 order. The order in which the entries are visited is selected so as to
 lead to the most efficient implementation; it might depend on the
 concrete implementation of this abstract class.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>visitor</code> - visitor to be used to process the entries of this vector</dd><dd><code>start</code> - the index of the first entry to be visited</dd><dd><code>end</code> - the index of the last entry to be visited (inclusive)</dd>
<dt><span class="strong">Returns:</span></dt><dd>the value returned by <a href="../../../../../org/apache/commons/math3/linear/RealVectorChangingVisitor.html#end()"><code>RealVectorChangingVisitor.end()</code></a>
 at the end of the walk</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></code> - if <code>end &lt; start</code>.</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if the indices are not valid.</dd><dt><span class="strong">Since:</span></dt>
  <dd>3.1</dd></dl>
</li>
</ul>
<a name="equals(java.lang.Object)">
<!--   -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>equals</h4>
<pre>public&nbsp;boolean&nbsp;equals(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;other)
               throws <a href="../../../../../org/apache/commons/math3/exception/MathUnsupportedOperationException.html" title="class in org.apache.commons.math3.exception">MathUnsupportedOperationException</a></pre>
<div class="block"><p>
 Test for the equality of two real vectors. If all coordinates of two real
 vectors are exactly the same, and none are <code>NaN</code>, the two real
 vectors are considered to be equal. <code>NaN</code> coordinates are
 considered to affect globally the vector and be equals to each other -
 i.e, if either (or all) coordinates of the real vector are equal to
 <code>NaN</code>, the real vector is equal to a vector with all <code>NaN</code>
 coordinates.
 </p>
 <p>
 This method <em>must</em> be overriden by concrete subclasses of
 <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear"><code>RealVector</code></a> (the current implementation throws an exception).
 </p></div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a></code>&nbsp;in class&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>other</code> - Object to test for equality.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if two vector objects are equal, <code>false</code> if
 <code>other</code> is null, not an instance of <code>RealVector</code>, or
 not equal to this <code>RealVector</code> instance.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathUnsupportedOperationException.html" title="class in org.apache.commons.math3.exception">MathUnsupportedOperationException</a></code> - if this method is not
 overridden.</dd></dl>
</li>
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<a name="hashCode()">
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<h4>hashCode</h4>
<pre>public&nbsp;int&nbsp;hashCode()
             throws <a href="../../../../../org/apache/commons/math3/exception/MathUnsupportedOperationException.html" title="class in org.apache.commons.math3.exception">MathUnsupportedOperationException</a></pre>
<div class="block">. This method <em>must</em> be overriden by concrete
 subclasses of <a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear"><code>RealVector</code></a> (current implementation throws an
 exception).</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a></code>&nbsp;in class&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathUnsupportedOperationException.html" title="class in org.apache.commons.math3.exception">MathUnsupportedOperationException</a></code> - if this method is not
 overridden.</dd></dl>
</li>
</ul>
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<h4>unmodifiableRealVector</h4>
<pre>public static&nbsp;<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;unmodifiableRealVector(<a href="../../../../../org/apache/commons/math3/linear/RealVector.html" title="class in org.apache.commons.math3.linear">RealVector</a>&nbsp;v)</pre>
<div class="block">Returns an unmodifiable view of the specified vector.
 The returned vector has read-only access. An attempt to modify it will
 result in a <a href="../../../../../org/apache/commons/math3/exception/MathUnsupportedOperationException.html" title="class in org.apache.commons.math3.exception"><code>MathUnsupportedOperationException</code></a>. However, the
 returned vector is <em>not</em> immutable, since any modification of
 <code>v</code> will also change the returned view.
 For example, in the following piece of code
 <pre>
     RealVector v = new ArrayRealVector(2);
     RealVector w = RealVector.unmodifiableRealVector(v);
     v.setEntry(0, 1.2);
     v.setEntry(1, -3.4);
 </pre>
 the changes will be seen in the <code>w</code> view of <code>v</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - Vector for which an unmodifiable view is to be returned.</dd>
<dt><span class="strong">Returns:</span></dt><dd>an unmodifiable view of <code>v</code>.</dd></dl>
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